Production of artificial threads



Sept. 19, 1939.

. G. CAMPOLUNGHI PRODUCTION OF ARTIFICIAL THREADS.

Filed Oct. 25, 1951 v XVI 4 70/? Patented Sept. 19, 1939 UNITED STATES.

2,173,621 PRODUCTION OF ARTIFICIAL THREADS Giovanni Campolunghi, Rome, Italy Application October 25, 1937, Serial No. 170,950

In Italy November 11, 1936 Several methods are already known for continuously transforming endless artificial filaments to staple fibre or in twisted threads of short fibres, but hitherto these methods have been never united directly with the spinning operation.

According to the known methods the said purpose was met either by cutting or by tearing the finished endless filaments to pieces of the desired length, and proceedings of this lrlnd are decribed for instance in the United States Patent No. 2,012,723, or in the British Patent No. 424,683, or in the Austrian Patent No. 143,153 and in other patents.

On the contrary, the process according to the invention consists in the producing during the viscose spinning process according to the centrifugal system, of a thread which is not endless, but is formed by tom filaments. According to the invention the endless bundle comprising a plurality or single filaments, on its passage from the tunnel to the spinning can, is conduced over a scabrous edge or an edge having cutting prominences, while, under the traction effect of the revolving can, it is obliged to slide on this scabrous edge provided on the lower end of the said funnel. In this way some of the single filaments forming the bundleare continuously torn or broken, and-.as the bundle of filaments is always 1 Claim. (Cl. 57-2) and according to the count of the thread to be produced and to the desired length of its single filaments.

A device suitable for the realisation of the described proceeding is shown by way of example in 5 the accompanying schematical drawing, but it has to be understood that this device may be modified in any details.

' As it is shown in the drawing, the bundle F of single endless filaments enters from above in the pipe A of the funnel and is then conduced by the inclined surface of the part B of this tunnel in the narrow aperture of the part B having a scabrous edge or surface C, on which, by the iriction effect of the bundle sliding around, several of the single filaments are always torn with the result that a thread formed by short fibres leaves the guide D being then twisted and collected in the revolving can. I

The members A, B, C, D may be parts separated the one from the other or united in a'single piece according to the material chosen for them.

What I claim is:

Apparatus for. the production of short-fibered twisted artificial threads comprising a tunnel through which a bundle .of filaments may be passed for delivery to a revolving spinning can,

said funnel being provided adjacent its lower end during their passage at an angle from the funnel to the revolving can.

GIOVANNI CAMPOLUNGHI. 

